Facioscapulohumeral Muscular Dystrophy in Children

What is FSHD in children?

Facioscapulohumeral muscular dystrophy (FSHD) is a rare genetic muscle disease that affects the muscles of your child’s face, shoulders, upper arms, and lower legs. These muscles weaken and shrink (atrophy). Symptoms usually appear before 20 years of age. The disease slowly gets worse, causing weakness in other parts of the body. Most children with FSHD remain able to walk.

How to say it

FA-shee-oh SKA-pyoo-loh HYOO-muh-ruhl

What causes FSHD in a child?

FSHD is caused by certain gene changes (mutations). Researchers think that the change may activate a gene called DUX4. This gene is normally inactive in most cells in the body. Other genetic factors may also play a role in FSHD.

FSHD affects both boys and girls. Either parent can pass it down to his or her children. This is an autosomal dominant inheritance pattern. A parent with the FSHD has a 1 in 2 chance of passing it on to each of his or her children.

Sometimes a child may have FSHD even though a parent doesn’t have the condition. This may happen because the defect that causes FSHD is found in some of the parent’s sperm or egg cells but not in the rest of the parent’s body cells. In this case, the parent may have an increased risk of passing the defect on to any of his or her other children as well.

In some cases, FSHD results from new (sporadic) mutations instead of through inheritance.

What are the symptoms of FSHD in a child?

Symptoms usually show up during the teenage years. But sometimes FSHD appears in babies. The first things you may notice are weakness in your child’s face and shoulder muscles. FSHD may affect one side of the body more than the other. Common symptoms include:

Shoulder blades that stick out from the back (scapular winging)

Trouble reaching up with the arms or throwing a ball

Difficulty whistling, blowing up a balloon, or using a straw

Difficulty turning the corners of the mouth up when smiling

Eyes not closing all the way during sleep

How is FSHD diagnosed in a child?

Your child’s healthcare provider will take a health history, asking about recent symptoms, past health conditions, and your family's health history. The healthcare provider will do a physical exam, including the affected muscles. Your child may need tests. These include:

Blood tests, for muscle enzymes such as creatine kinase

DNA blood tests, to look for the defect

Electromyography, to measure the electrical activity of the muscles

MRI, to see the pattern of muscle damage

Muscle biopsy, to look at the muscle cells or confirm a diagnosis

Your child’s healthcare provider may make a diagnosis based on the exam and some of the above tests or other tests. Your child may first see his or her primary healthcare provider and then be referred to a neurologist. Some neurologists have special training to treat nerve and muscle diseases such as FSHD. Your child may also need care from other providers such as physical therapists.

How is FSHD treated in a child?

There is no cure for the disease. Treatment focuses on supportive treatment to help your child manage the symptoms. Physical therapy is a key part of managing FSHD.

Nonsteroidal anti-inflammatory medicines. These may ease muscle inflammation and pain.

Scapular fixation. -This surgery can keep the shoulder blade in one spot to help your child use his or her arms. But surgery is not always successful.

Support devices. These include corsets, back supports, bras, lower-leg braces, and high-top shoes.

What are possible complications of FSHD in a child?

The muscle weakness in FSHD tends to get worse slowly and does not usually affect life span. It often affects other muscles of the body, especially the lower legs, belly (abdomen), and hips. As FSHD gets worse, you may notice some of these other symptoms in your child:

Difficulty lifting the feet (foot drop). This may cause your child to drag his or her feet or lift his or her knees to walk with high steps.

Swayback (lordosis) in the lower back. This is because of weakened abdominal muscles.

Hip weakness. This only happens in some people with FSHD, usually in midlife. About 1 in 5 of people with FSHD need to use a wheelchair at some point.

Minor hearing loss. This is especially true for high pitches.

Problems affecting the retina of the eye (uncommon)

Sideways curving of the spine (scoliosis) (uncommon)

Rigid joints in the ankles that are hard to move (contractures) (uncommon)

Heart problems (rare)

Breathing problems (rare)

Key points about FSHD in children

FSHD is a rare genetic muscle disease that causes weakness in the muscles of your child’s face, shoulders, upper arms, and lower legs.

FSHD affects both boys and girls. Symptoms usually first appear in the teenage years. The disease slowly gets worse.

At first, FSHD may make it difficult to whistle, drink from a straw, smile, lift up the arms, or throw a ball. The condition may get worse and cause loss of mobility.